Dose counters for inhalers, inhalers and methods of assembly thereof

摘要

A manually operated metered dose inhaler includes a dose counter chamber including a dose display tape driven by a ratchet wheel which is driven in turn by an actuator pawl actuated by movement of a canister, the tape unwinding from a stock bobbin during use of the inhaler, a rotation regulator being provided for the stock bobbin and including a wavelike engagement surface with concavities which engage against control elements in the form of protrusions on resilient forks of a split pin thereby permitting incremental unwinding of the stock bobbin yet resisting excessive rotation if the inhaler is dropped onto a hard surface.

主权项

1. A method of assembling an inhaler having a body for retaining a medicament store, a dose counter having a moveable actuator, and a return spring for the actuator, said method comprising:
locating an end of the return spring on a shelf on the body with an assembly tool; and withdrawing the assembly tool at least partly via a recess that is defined below the shelf.